Struggling.

Need advice!
We have a 3 yr old girl named Anneke (pronounced on ah ka, a at the end is more silent :-)
It's a European name.
We both come from European backgrounds; Dutch and my husband was born in Czech
We like unique names, vintage perhaps old fashioned

Personally, I think the Dutch version Beatrix would be better with Anneke. I like Arlo but I prefer siblings to have their own initial. I love Cassius and Levi is fine too. I don't know what your surname is so I'll just choose names that would be a good "fit" with Anneke's name.